Which one of the following statements is incorrect ?A. In Half-Heroult process, the electrolytes used is a molten mixture of alumina, sodium hydroxide and cryolite.B. Lead is extracted form its chief ore by both carbon reduction and self reductionC. Zinc is extracted from its chief ore by carbon reductionD. Extraction of gold involves the leaching of ore with cyanides solution followed by reduction with zinc.

Which one of the following statements is incorrect ?A. In Half-Heroult

1.	Which one of the following statements is incorrect ?A. In Half-Heroult process, the electrolytes used is a molten mixture of alumina, sodium hydroxide and cryolite.B. Lead is extracted form its chief ore by both carbon reduction and self reductionC. Zinc is extracted from its chief ore by carbon reductionD. Extraction of gold involves the leaching of ore with cyanides solution followed by reduction with zinc.
Answer» Correct Answer - A (A) It is molten mixture of alumina and cryolite (B)`2PbS+3O_2to2PbO+2SO_2` `PbS+2PbOto3Pb+SO_2`(self reduction) `PbO+C to Pb+CO`(carbon reduction)m (C )`ZnO+C to Zn+CO`(carbon reduction) (D)`4Au(s)+8CN^(-)(aq)+2H_2O(aq)+O_2(aq)to4[Au(CN)_2]^(-)(aq)+4OH^(-)(aq)`-leaching `2[Au(CN)_2]^(-)(aq)+Zn(s)to2Au(s)+[Zn(CN)_4]^(2-)(aq)`-reduction

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